const obj1 = {
    a: 10,
    b: 20,
    sum() {
        return this.a + this.b
    }
}
const obj2 = new Object({
    a: 10,
    b: 20,
    sum() {
        return this.a + this.b
    }
})
const obj21 = new Object(obj1) // obj1===obj21
const obj3 = Object.create(null)
const obj4 = new Object()
const obj5 = Object.create({})
const obj6 = Object.create(obj1) // obj1!==obj6    obj6.__proto__===obj1

